One can see old iMac Commercials in Youtube which features the different types of commercial about old iMac such as All Mac vs. TV adds, Apple iMac vs. HP, and iMac G3 starting up.
You need no adapters.
If it has a television capability.
Yes you can connect your wireless and USB iMac keyboard to PC or other iMac's. If you want to know how there are some videos on YouTube to help you do this.
i can't connect my mobil phone to computr
All the software you need comes preinstalled on an iMac.
Use bluetooth to connect them. Both are bluetooth ready.
Yes, it will work perfectly.
yeah! you can connect your gaming control
Yes, but you may need an adaptor.
can you connect to my tv
Connect the external speaker system to the Audio Output on the rear of the iMac. It is the connection on the far left of the rear of the iMac when you are looking at the rear. The speakers will have to be self powered speakers computer speakers.